Which of the following is the largest unit of measure?

Consumers prefer mobile commerce sites ________.

A. ?that have many low price items on sale B. ?that are convenient and efficient to use C. ?that are linked to the consumers' banks D. ?that belong to traditional stores like Wal-mart or Best Buy

The first node of a tree is the _________ node.

Fill in the blank(s) with the appropriate word(s).